:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1c1d21;
  --muted: #5d6270;
  --accent: #2a6bd8;
  --border: #e3e5ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #191c22;
    --text: #eceef2;
    --muted: #9aa1ae;
    --accent: #6ba6ff;
    --border: #2a2e37;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Helvetica Neue", sans-serif;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
header img { width: 56px; height: 56px; border-radius: 13px; }
h1 { font-size: 1.6rem; margin: 0; line-height: 1.3; }
.sub { color: var(--muted); margin: 0 0 28px; }
section { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px 22px; margin: 16px 0; }
h2 { font-size: 1.1rem; margin: 0 0 8px; }
p, li { margin: 6px 0; }
ul { padding-left: 1.3em; }
a { color: var(--accent); }
.lang { font-size: .9rem; color: var(--muted); margin-bottom: 24px; }
.lang a { margin-right: 12px; }
footer { color: var(--muted); font-size: .85rem; margin-top: 32px; }
hr { border: none; border-top: 1px solid var(--border); margin: 40px 0; }